On Fri, 7 May 2010, Jonas Schwertfeger wrote: > On 04/29/2010 05:45 PM, Alan Stern wrote: > > I would still like to see a usbmon trace of hdparm under USB-2. > > hdparm through USB-2: > > /dev/sdb: > outgoing cdb: 85 08 2e 00 00 00 01 00 00 00 00 00 00 40 ec 00 > data: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 > SG_IO: ATA_16 status=0x0, host_status=0x0, driver_status=0x0 > SG_IO: bad response (not CHECK_CONDITION) > Trying legacy HDIO_DRIVE_CMD > outgoing cdb: 85 08 2e 00 00 00 01 00 00 00 00 00 00 40 a1 00 > data: 40 00 ff 3f 37 c8 10 00 00 00 00 00 3f 00 00 00 > SG_IO: ATA_16 status=0x2, host_status=0x0, driver_status=0x8 > SG_IO: sb[]: 72 0b 00 00 00 00 00 0e 09 0c 00 04 00 01 00 00 00 00 00 > 00 40 51 00 00 00 00 00 00 00 00 00 00 > SG_IO: desc[]: 09 0c 00 04 00 01 00 00 00 00 00 00 > ATA_16 stat=51 err=04 nsect=01 lbal=00 lbam=00 lbah=00 dev=40 > I/O error, ata_op=0xa1 ata_status=0x51 ata_error=0x04 > HDIO_DRIVE_CMD(identify) failed: Input/output error > readonly = 0 (off) > readahead = 256 (on) > geometry = 121601/255/63, sectors = 1953525168, start = 0 > > ffff8801f8199540 602153163 S Bo:1:003:2 -115 31 = 55534243 d4000000 > 00020000 80001085 082e0000 00010000 00000000 40ec00 > ffff8801f8199540 602153314 C Bo:1:003:2 0 31 > > ffff8801f8184d80 602153376 S Bi:1:003:1 -115 512 < > ffff8801f8184d80 602159046 C Bi:1:003:1 0 512 = 00000000 00000000 > 00000000 00000000 00000000 00000000 00000000 00000000 > ffff8801f8199540 602159103 S Bi:1:003:1 -115 13 < > ffff8801f8199540 602159156 C Bi:1:003:1 0 13 = 55534253 d4000000 00000000 00 > ffff8801f8199540 602159382 S Bo:1:003:2 -115 31 = 55534243 d5000000 > 00020000 80001085 082e0000 00010000 00000000 40a100 > ffff8801f8199540 602159536 C Bo:1:003:2 0 31 > > ffff8801f8184d80 602159594 S Bi:1:003:1 -115 512 < > ffff8801f8184d80 602159791 C Bi:1:003:1 -32 0 > ffff8801f8199540 602159846 S Co:1:003:0 s 02 01 0000 0081 0000 0 > ffff8801f8199540 602159900 C Co:1:003:0 0 0 > ffff8801f8199540 602159951 S Bi:1:003:1 -115 13 < > ffff8801f8199540 602160029 C Bi:1:003:1 0 13 = 55534253 d5000000 00020000 01 > ffff8801f8199540 602160100 S Bo:1:003:2 -115 31 = 55534243 d6000000 > 60000000 80000603 00000060 00000000 00000000 000000 > ffff8801f8199540 602160159 C Bo:1:003:2 0 31 > > ffff8801f8184d80 602160201 S Bi:1:003:1 -115 96 < > ffff8801f8184d80 602160276 C Bi:1:003:1 0 96 = 00000000 00000000 > 00000000 00000000 00000000 00000000 00000000 00000000 > ffff8801f8199540 602160334 S Bi:1:003:1 -115 13 < > ffff8801f8199540 602160418 C Bi:1:003:1 0 13 = 55534253 d6000000 00000000 00 > ffff8801f8199540 602161915 S Bo:1:003:2 -115 31 = 55534243 d7000000 > 00100000 80000a28 00000000 00000008 00000000 000000 > ffff8801f8199540 602162023 C Bo:1:003:2 0 31 > > ffff8801f8184d80 602162080 S Bi:1:003:1 -115 4096 < > ffff8801f8184d80 602162284 C Bi:1:003:1 0 4096 = 00000000 00000000 > 00000000 00000000 00000000 00000000 00000000 00000000 > ffff8801f8199540 602162344 S Bi:1:003:1 -115 13 < > ffff8801f8199540 602162405 C Bi:1:003:1 0 13 = 55534253 d7000000 00000000 00 Hmm. I'm not sure I believe this data. For a while (starting with 2.6.33) the usbmon implementation didn't work right with EHCI -- it looked in the transfer buffer before the DMA-unmapping was done, so on a system with >= 4 GB of memory it wouldn't always see the data. The fix for this was merged only within the last week or so. Can you repeat the USB-2.0 test but this time doing "rmmod ehci-hcd" beforehand? Alan Stern -- To unsubscribe from this list: send the line "unsubscribe linux-hotplug" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
